Bow scope mount



1966 L. Y. POWELL 3,266,149

BOW SCOPE MOUNT Filed May 13, 1963 2 Sheets-Sheet 1 H J H d/ J HGUREFIGURE 2 l4 Aug. 16, 1966 L. Y. PQWELL BOW SCOPE MOUNT 3 Sheets-Sheet 2Filed May 13, 1963 FIIGIU/RE 4i IFI/GlU/RE 3 Lark/n Y P r 3,266,149 IcePatented August 16, 1966 3,266,149 BOW SCOPE MOUNT Larkin Y. Powell,Fairchild US. Air Force Base, Wash., assignor to SKA Scope Mount, Inc.,Spokane County, Wash, a corporation of Washington Filed May 13, 1963,Ser. No. 279,963 2 Claims. (Cl. 33-46) This invention relates generallyto a mounting for telescopic sight for archery that is attachable to anordinary bow, and more particularly to a mounting mechanism fastened toan ordinary archery bow adapted to hold a pistoltype telescopic sight sothat it may be readily adjusted for both large and small variations invertical and horizontal directions.

Heretofore archery bow-sights of various sorts have been known in theart. Many of such sights have been of complex, cumbersome construction,have obscured a portion of the target, and have not provided thecomplete and extensive adjustability required for such sights.

A bow sight, to function properly, requires that the bow should firstlybe properly positioned by a particular archer for his particular styleand mannerisms of shooting and his head then comforatably and normallypositioned; the sight then will have to be coarsely positioned inrelation to this how position so that the line of sight passes directly[from the archers eye to the intended target. Initially the sight musthave sufficient adjustment to provide for this aforesaid positioning.Obviously it the positioning of either the bow or the archers headrelative to his body stance be changed the line of sight andconsequently the [flight of the arrow and its point of impact will bechanged.

Previously known sights have generally provided a forward and rearwardpart that may be aligned with each other and a proposed target toindicate the arrows line of impact at a given distance. In using suchsights, a part of the proposed target is obscured and it is very easy tomove the position of the archers head and eyes in relation to normalshooting position; this would consequently change the point of arrowimpact. With this alignment type sight, it is also very diflioult, ifnot impossible, to determine from the physical factors involved Whetherthe shooting position is erroneous, particularly as to improper bow-handtorque, release finger torque, heelin-g of the bow, slipping oi thenocking point or fistmele error. With these problems in mind theproposed invention seeks to provide a telescopic sighting device whichlessens and alleviates the problems previously experienced with otherbow sighting devices.

In doing so: a

It is a principal object of my invention to provide a telescopic archerybow sight adjustably mounted upon a bow by a device that is bothcoarsely and finely adjustable for correction of line of sight in bothvertical and horizontal planes.

It is a further object of my invention to provide a device of the natureaforesaid having a telescopic sight of long eye relief and narrowobjective cone of vision, of the type commonly known as a pistol scope.

It is a further object of my invention to provide a telescopic sight asaforesaid that is internally adjustable to move the line of sight in avertical plane to allow for trajectory of an arrow.

It is a further object of my invention to provide a device of the natureaforesaid with a bow mount that releasably holds and uniquely positionsa scope of commerce in an adjustable fashion so that a line of sightthrough it, relative to the bow, may be changed a predetermined amountin either a vertical or horizontal plane.

It is still a [further object of my invention to provide a device of thenature aforesaid that is of new and novel design, of rugged and durablenature and of simple and economic manufacture.

Other advantages and objects of my present invention will be apparentfrom consideration of the following detailed description and specificembodiment thereof and claims therefor.

In the acompanying drawings which form a part of the specification, andin which like numbers of reference refer to similar parts throughout:

FIGUR E 1 is an orthographic side view of a centershot bow of commercewith arrow fletched therein, showing my invention attached to the bowand the line of sight through the sight.

FIGURE 2 is an enlarged detailed orthographic view taken on a horizontalplane looking downward at the top of the scope-mount of my invention, onthe plane 22 of FIGURE 1 in the direction indicated by the arrows, shoing the details thereocf.

FIGURE 3 is an exploded isometric view of the various parts of the mountOtf my invention showing the details in relationship to each other andmanner of assemblage.

FIGURE 4 is a partial exploded isometric view of the scope collar anddovetailed mounting plate of my invention that releasably attaches tothe mount shown in FIG- URE 3.

The terms right and left, upper and lower, horizontal and vertical areconvenient in describing the invention and are used herein to indicatenormal positions the bow in question be held in a normal shootingposition by a righthanded archer.

Referring now to the drawings in greater detail and particularly to thatof FIGURE 1, my invention will there be seen mounted on an ordinarycenter shot bow 12. The invention comprises the pistol type telescopicsight 10 carried by the scope mount 11 which is in turn carried by thehow 12. The device is adapted equally well for use with any of thecommon bows of commerce notwithstanding that it is illustrated on thecenter shot type.

The telescopic sight 10 is of an ordinary variety of commerce heretoforewell known. We prefer to use the type commonly distributed by the D.-P.Bushnell & Co., Inc., Bushnell Building, 2828 East Foothill Blvd.,Pasadena, California. This particular telescope has a relatively narrowobjective cone of vision of some 12 degrees or so and presents anobjective image in focus at the distance of about 24 inches behind theeyepiece lens. This amount of relierf is, of course, necessary by reasonof the way in which the scope will be used. The telescope has internalmeans, pretferably prismatic, of slightly moving the optical axis of thedevice with reference to the horizontal to compensate for the necessaryadded height of trajectory for distant targets, and for variation lfromvertical for windage. The knob 13 positions for vertical adjustment andthe knob 14 for horizontal adjustment. The telescope tube 15 is carriedin the tube mount 16, having the radially outwardly projecting femaledovetail joint 17 adapted to releasably carry the mating scope plate 18.

The scope plate 18 is a flat rectangular piece, as illustrated best inFIGURE 4. It has its sides machined to the corresponding male part tofit within the dovetail joint 17 of the tube mount 16. It is held inposition in the tube mount 16 by means of the Allen screws 19 threadlyengaged through the tube mount 16 to exert pressure on the sides of thescope plate 18 and hold it rigidly in predetermined position. "Ihe scopeplate 1 8 has the centrally aligned perpendicularly projecting guide pin20 and the internally threaded thumbscrew hole 21, both adapted touniquely position the tube mount 16 upon the telescope mounting table 40of the scope mount 11.

The scope mount 11 itself comprises the elongate rectangular plate likebody member 22 having aligned along ot the look-nuts 1.

its longer central axis the rearward hole 23 and forward hole 24 adaptedto receive the two horizontal alignment screws 27.. Immediately forwardor the hole 24 is a similar centrally positioned hole 25 adapted toreceive the bow bracket bolt 28. Forward of this is the elongatevertical adjustment slot 26-adapted to moveaibly receive the verticaladjustment screw 29 and yet allow the body member 22 to rotate in avertical plane about the center of the hole 25; to accomplish this,obviously, the center of the adjustment slot 26 must beat part of theradius of a circle haying the center ot the hole 25 for its center, andthe width of the slot must be approximately the diameter of the verticaladju'stm'e'nt screw 29.

The lateral bow bracket 30 is a flat rectangular member, Olf the shapeillustrated, preferably with rounded corners. \It has aligned al'ongits'longer axis the forward wood screw hole 31, theimmedi'ately rearwardthreaded vertical adjustmentscrew hole 32 adapted to receive thevertical adjustment screw 29, to the rearward of this a second woodscrew hole 33 and in the rearmost portion the bow bracket bolt hole 34sized to receive the bow bracket bolt 28.

The rearward how bracket 35 is an angular member having the bow leg 36at substantially right angles to the fastening leg 37; its width alongthe line of meeting of the two legs is substantially the same as theshorter rectangular dimension Olf the body member 22 in a verticalplane. The bow leg '36 carries the two similar spaced wood screw holes38 and the bow bracket'bolt hole 39 sized to receive the bow bracketbolt 28.

. The scope mounting table 40 is a rectangular plate-like member asillustrated, preferably with rounded corners. It carries, along itslonger axis in its'forward portion the pin hole 41 adapted to receivethe guide pin 20 or the scope plate 18; to the rearward the forwardhorizontal alignment screw hole 42, to the rearward of this theunthreaded thumlbscrew hole '43 and in the rearward-most portion arearward horizontal adjustment screw hole 4 4.

The scope mount is assembled as illustrated in FIG- URE 3. The bodymember 22'is first positioned with the lateral bow bracket 30immediately laterally adjacent to the bow 12 and the rearward bowbracket 35 immediately laterally adjacent to member 30 so that therespective holes 25, 34,39 are all in a line to receive the bow bracketbolt 28; this bolt 28 is then put into place with the washers 45 on eachside of the body member 22 and between the rear body bracket 35 andthe'nut 46. The nut 46 is then positioned on the bolt 28 to secure saidmembers 22, 30, 35. The vertical adjustment screw 29 is then placedthrough the adjustment slot 26 and threadedly engaged in the threadedvertical adjustment screw hole 32 ot the lateral bow bracket 30, withwashers 47 disposed be tween the screwhead and the body member 22 andbetween the body member 22 and the lateral bow bracket 30.

The horizontal alignment screws 27 are nextly positioned in the holes42, 44 of the scope mounting table 40 and held in position therein bythe nuts 48. The horizontal alignment screws 27 should be of thebevel-headed variety and an appropriate recess 49 provided therefor inthe surface of the scope mounting table 40 so that the heads of thescrews 27 will not project above the lateral surface of the member 40and interfere with the mounting of the scope plate 18 thereon. A secondnut 50 is then placed on each or the horizontal alignment screws 27 andthe screws then positioned within the holes 23, 24- Olf the body member22. They are held in this position by means The scope mount 11 is thencompletelyassenrbled readyto receive the scope plate 18 carrying thetelescope 10. To attach the two members, the pin 20 is positioned in thepin hole 41 of the scope mounting table 40 and the thumbscrcw 52 isengaged with the threaded thumbscrew hole 21 of the member 18 until arigid unique connection is established.

The various parts of my scope mount must obviously be sized asillustrated in the drawings, to accomplish the aforesaid results and toallow sufiicient clearance between the various members for the operationdescribed.

To install my scope mount 11 upon a bow 12, the telescopic sight 10 mustfirst be removed. The scope mount- 22 is then removed from the bowbrackets 30, 35. Then additional wood screws 54 are inserted through theholes 31, 33 to fasten the lateral bow bracket 30 rigidly to the how.The body member 22 is then replaced and the scope mounting table 40 isalso replaced. The de- Ivice is now ready for rough alignment and use.

The mount is roughly aligned vertically by loosening the verticaladjustment screw 29 and moving the body member 22 appropriately untilthe desired adjustment is reached, whereupon the adjustment screw 29 isagain tightened to maintain this member 22 in the desired position.Horizontal adjustment of the device is attained by differential movementOlf the horizontal alignment screws 27; the 'forward screw may beshortened and the rearward screw lengthened or vice versa to move thescope mounting table 40 for hange ott direction in a horizontal plane.Obviously the horizontal adjustment screw holes 23-, 24 in the bodymember 22 must be of a bore slightly larger than the external diameterof the horizontal alignment screws 27 to permit this skew positioning ofthe screws without damage to their threads, but this difference indiameter should not be too great or too much unwanted movement may beallowed between the members 40 and 22.

When the device is aligned initially for any particular archer, thealignment must be accomplished by trial and error or field tests. Thisis necessary because each particular archer has his own peculiarshooting position and to originally align the sight it is necessary todetermine this particular positioning ineach case. The initialadjustments are taken up as aforesaid in the scope mount itself.Thereafter, it adjustments be desired for windage, elevation, distanceor the like, these may be provided for most conveniently by using theinternal structure of the telescope 10 as aroredescribed. 1

While a specific embodiment of my invention has been disclosed in theforegoing specification, it should be understood that the specificterminology and structure are not-intended to be restrictive orconfining, and that various rearrangements of parts, modifications ofdetail, and substitutions Olf materials may be resorted to withoutdeparting from the essence, scope or spirit of the invention hereindisclosed and hereinatfiter claimed.

Having thusly described my invention, what I desire to protect byLetters Patent, and,

What I claim is:

1. A mounting device for mounting a telescopic sight upon an archery bowof the nature aforesaid, comprising in combination, a planar lateral bowbracket having means (for attaching it to the lateral face orf a bow ofcommerce, a rearward bow bracket having means for attaching to therearward face or the bow and substantially perpendicularly to saidplanar bow bracket a rectangular plate-like body member rotatablyconnecting in its central portion with, and lying parallel to saidplanar lateral bow bracket and said substantially perpendicular rearwardbow bracket; means of securing the adjusted angle between the longeraxis of said body member and said lateral bow bracket member; and aplate-like scope mounting table and two horizontal alignment screwsconnecting it with the rearward portion of said body member, said screwsadapted to adjustably position said scope mounting table at a presesame5 6 determined angle measured on a horizontal plane with ReferencesCited by the Examiner reference to said body member. UNITED STATESPATENTS 2. The device of claim 1 having means associated with said scopemounting talble to mount a telescopic sight of S I' Z; ;2

commerce, comprising a mounting plate having a forward 5 6/1939 iprojecting pin adapted to mate within a corresponding 10/1939 1h 248 23hole of said mounting table and a centrally positioned 6 X threadedthumbscrevv hole adapted to receive a thumb- 2215117 9/1940 crewman248-43 2,237,395 4/1941 Sweet 33-50 screw passing through said scopemounting table and into 3 063 151 11/1962 said mounting plate, and meansof attaching said scope 10 plate rigidly to a telescope of commerce.ROBERT B HULL, Primary Examiner Hanson 33-46

1. A MOUNTING DEVICE FOR MOUNTING A TELESCOPIC SIGHT UPON AN ARCHERY BOWOF THE NATURE AFORESAID, COMPRISING IN COMBINATION, A PLANAR LATERAL BOWBRACKET HAVING MEANS FOR ATTACHING IT TO THE LATERAL FACE OF A BOW OFCOMMERCE, A REARWARD BOW BRACKET HAVING MEANS FOR ATTACHING TO THEREARWARD FACE OF THE BOW AND SUBSTANTIALLY PERPENDICULARLY TO SAIDPLANAR BOW BRACKET A RECTANGULAR PLATE-LIKE BODY MEMBER ROTATABLYCONNECTING IN ITS CENTRAL PORTION WITH AND LYING PARALLEL TO SAID PLANARLATERAL BOW BRACKET AND SAID SUBSTANTIALLY PERPENDICULAR REARWARD BOWBRACKET; MEANS OF SECURING THE ADJUSTED ANGLE BETWEEN THE LONGER; AXISOF SAID BODY MEMBER AND SAID LATERAL BOW BRACKET MEMBER; AND APLATE-LIKE SCOPE MOUNTING TABLE AND TWO HORIZONTAL ALIGNMENT SCREWSCONNECTING IT WITH THE REARWARD PORTION OF SAID BODY MEMBER, SAID SCREWSADAPTED TO ADJUSTABLY POSITION SAID SCOPE MOUNTING TABLE AT APREDETERMINED ANGLE MEASURED ON A HORIZONTAL PLANE WITH REFERENCE TOSAID BODY MEMBER.